Price - I can't find any recent examples for an idea (so far), so can only start at what Extreme themselves last sold it for!
No. There's the main kit, headlights (and covers) and 2 seat conversion. The metal parts are included, too.
Build DVD, had a few issues last time, I tried to watch it, so may need a new one. And I think a couple of smaller bits have been lost along the way. Wouldn't be loads though, I don't think and nothing that couldn't be remade easily enough!
I have 406 CD changer (although, now largely irrelevant), 406 Climate Control unit (was spare from my old one), and a radio to steering wheel stalk control lead (will just need a stalk and fitting it!). I also have a couple of twin exhaust tips, but may sell separate.